(1)增量型:就是每转过单位的角度就发出一个脉冲信号(也有发正余弦信号，
然后对其进行细分，斩波出频率*高的脉冲)，通常为A相、B相、Z相输出，A相、B相为相互延迟1/4周期的脉冲输出，根据延迟关系可以区别正反转，而且通过取A相、B相的上升和下降沿可以进行2或4倍频；Z相为单圈脉冲，即每圈发出一个脉冲。
(2)**值型:就是对应一圈，每个基准的角度发出一个一与该角度对应二进制的数值，通过外部记圈器件可以进行多个位置的记录和测量。
2、按信号的输出类型分为:电压输出、集电极开路输出、推拉互补输出和长线驱动输出。
3、以编码器机械安装形式分类
(1)有轴型:有轴型又可分为夹紧法兰型、同步法兰型和伺服安装型等。
(2)轴套型:轴套型又可分为半空型、全空型和大口径型等。
4、以编码器工作原理可分为:光电式、磁电式和触点电刷式。
(1) Incremental type: it sends a pulse signal every time you turn the angle of a unit (there are also sine and cosine signals,
Then subdivide it, chopping out the pulse with high frequency *), which is usually the output of phase a, phase B and phase Z. phase A and phase B are the pulse output with mutual delay of 1/4 cycle. According to the delay relationship, the forward and reverse directions can be distinguished, and the frequency can be doubled or quadrupled by taking the rising and falling edges of phase A and phase B; Phase Z is a single cycle pulse, i.e. one pulse per cycle.
(2) * * value type: it corresponds to a circle, and each reference angle sends out a binary value corresponding to the angle. Multiple positions can be recorded and measured through external circle recording devices.
2. According to the output type of signal, it is divided into voltage output, open collector output, push-pull complementary output and long line drive output.
3. Classified by encoder mechanical installation form
(1) Shaft type: shaft type can be divided into clamping flange type, synchronous flange type and servo installation type.
(2) Shaft sleeve type: shaft sleeve type can be divided into half empty type, full empty type and large diameter type.
4. According to the working principle of encoder, it can be divided into photoelectric type, magnetoelectric type and contact brush type.
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